The girth of an object is a measurement around it. It is sometimes used by postal services and delivery companies as a basis for pricing. For example, Canada Post requires that an item's length plus girth not exceed a maximum allowed value. For a rectangular box, the girth is 2 * (height + width), for example the perimeter of a cross section perpendicular to its length. Girth may also refer to: Girth (tack), a piece of equipment used to keep the saddle in place on a horse. Girth (graph theory),… (More on Girth)